Let p be a point on the hyperbola (x ^ 2 of 16) - (y ^ 2 of 9) = 1, and the distance from P to one focus of the hyperbola is 10, then what is the distance from P to another focus

Let p be a point on the hyperbola (x ^ 2 of 16) - (y ^ 2 of 9) = 1, and the distance from P to one focus of the hyperbola is 10, then what is the distance from P to another focus

2a=8
Let | Pf1 | = 10, then | PF2 | - 10 | = 8
|PF2 | = 18 or 2
And C-A = 25-4 = 1
So | PF2 | = 18 or 2 are in line with the meaning